In a fuel economy study, each of 3 race cars is tested using 5 different brands of gasoline at 7 test sites located in different regions of the country. If 2 drivers are used in the study, and test runs are made once under each district set of conditions, how many test runs are needed?

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Q: A statistics teacher asked two different students, Lexie and Jennifer, to go to Wegmans and sample…

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